libobjc2 build broken on OS X

[Charalampos Emmanouilidis]

The current version (git master branch) of libobjc2 does not compile for OS X.

associate.m:423:40: warning: direct access to objective-c's isa is deprecated in favor of object_setClass() and object_getClass() [-Wdeprecated-objc-isa-usage]

        id new = class_createInstance(object->isa, 0);

                                              ^

11 warnings generated.

Compiling blocks_runtime.m...

Compiling block_to_imp.c...

block_to_imp.c:43:10: warning: implicit declaration of function 'asprintf' is invalid in C99 [-Wimplicit-function-declaration]

        if (0 > asprintf(&tmpPattern, "%s/objc_trampolinesXXXXXXXXXXX", tmp))

                ^

block_to_imp.c:139:17: warning: implicitly declaring library function 'strdup' with type 'char *(const char *)'

        char *buffer = strdup(block_getType_np(block));

                       ^

block_to_imp.c:139:17: note: please include the header <string.h> or explicitly provide a declaration for 'strdup'

2 warnings generated.

Assembling block_trampolines.S...

Assembler messages:

Fatal error: invalid listing option `r'

clang: error: assembler command failed with exit code 1 (use -v to see invocation)

make: *** [block_trampolines.o] Error 1

it seems, that the clang compiler passes wrong options to the assembler.

[ as -arch x86_64 ] is not a valid argmunt for command as on OSX. 

Yoy may refer to my build log for details:

https://gist.github.com/4167458

It would be really great if anybody has a solution to this! 

I want to use GNUstep for cross platform development (OS X, Linux, iOS, Android, Windows) and 

I  need to get libobjc2 and gnustep-base running on OS X.